[key: &value]
[key: value \\ default]
[key: value when other_key: other_value]
[key: value when guard]
[key: value :: type]
[key: one | two]
[key: one = two]
[key: one or two]
[key: one || two]
[key: one and two]
[key: one && two]
[key: one == two]
[key: one < two]
[key: one |> two]
[key: one in two]
[key: one / two]
[key: one * two]
[key: one ^^^ two]
[key: !one]
[key: Alias.|> positional]
[key: Alias."function"]
[key: @one]
[key: value]
[key: @1]
[key: &1]
[key: !1]
[key: not 1]
[key: 1]
[key: [inner_key: inner_value]]
[key: "StringLine"]
[key: """
      String
      Heredoc
      """]
[key: "CharListLine"]
[key: """
      CharList
      Heredoc
      """]
[key: ~x{sigil}o]
[key: nil]
[key: :atom]
[key: Alias]
